I liked Mark's (Markeb01) Procar Buckets so much I followed his lead.
If your looking for more of "period correct" look these low back buckets fit that vibe, IMHO.
I built custom brackets for them that also incorporate seat belt brackets. The seats come with 3 adjustable height positions, include the adjustment track, they recline and they have a map pocket in the back.
More information can be found on my build thread.
I hope this helps.